Brian Gaff wrote:
It may well be that there are some holes in the dust protection and debris
has taken its toll.

The dust cap (if that's what it is) does have slots, but I can't see if
there's anything lodged inside.

One might wont to bite the bullet and get something different.
Some speakers last forever almost, but it seems to depend on the materials
used for the suspension and dust covers. I still have nice sounding Tannoy
dual concentric from the late 60s, but later model Missions of a friend have
had serious problems in the rubbing area!
Some lowthers have had to be totally renovated.
Interestingly a pair of budget Wharfdales from the 60s still work remarkably
well!
Brian

Indeed, strangest thing, I've owned all manner of speakers and this is
the first one I've had that's failed. I did buy some old Castle speakers
once and didn't notice the cone surround had come unstuck from the
frame. Also, and wouldn't you believe it, the one that's failed is the
most expensive.

I can see very very few references to failed Dynaudio drivers on
t'internet. I think I might see if Dynaudio will consider some kind of
goodwill gesture, but that'll almost certainly involve sending them
back. I'll enquire next week.

Thanks everyone for the input.

Rob

"Rob"

The dust cap (if that's what it is) does have slots, but I can't see if
there's anything lodged inside.


** The " dust cap " or "dust dome" is fitted right in the centre of a cone
and is glued to the inner party of that cone - if part of that gluing
comes adrift, the cap can make loud, hammering noises when the cone is
driven at low frequencies.

The "dust cap" is also part of the sound radiating surface and cannot have
holes in it that would pass air when the cone moves back and forth.

Sometimes there are visible holes in the top part of the voice coil former,
near where it attaches to the cone, that you can easily see with the driver
removed.



...... Phil